deeptools/HiCExplorer: March release

The 2.1 version of HiCExplorer comes with new features and bugfixes.

• Adding the new feature hicAggregateContacts: A tool that allows plotting of aggregated Hi-C sub-matrices of a specified list of positions.
• Many improvements to the documentation and the help text. Thanks to @GinaRe and @gtrichard.
• hicPlotMatrix:
  • supports only bigwig files for an additional data track.
  • the argument --pca was renamed to --bigwig
  • Smoothing the bigwig values to neighboring bins if no data is present there
  • Fixes to a bug concerning a crash of tight_layout
  • Adding the possibility to flip the sign of the values of the bigwig track
  • Adding the possibility to scale the values of the bigwig track
• hicPlotViewpoint: Adds a feature to plot multiple matrices in one image
• cooler file format:
  • supports mcool files
  • applies correction factors if present
  • optionally reads bin['weight']
• fixes:
  • a crash in hicPlotTads if horizontal lines were used
  • checks if all characters of a title are ASCII. If not they are converted to the closest looking one.
• Updated and fixate version number of the dependencies